Public holidays
1644, Russia
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year Holiday |
| 2 | Saturday, 2 January 1644 | New Year Holiday |
| 3 | Sunday, 3 January 1644 | New Year Holiday |
| 4 | Monday, 4 January 1644 | New Year Holiday |
| 5 | Tuesday, 5 January 1644 | New Year Holiday |
| 6 | Wednesday, 6 January 1644 | New Year Holiday |
| 7 | Thursday, 7 January 1644 | New Year Holiday |
| 8 | Friday, 8 January 1644 | New Year Holiday |
| 9 | Tuesday, 23 February 1644 | Defender of the Fatherland Day |
| 10 | Tuesday, 8 March 1644 | Women's Day |
| 11 | Sunday, 1 May 1644 | Spring and Labour Day |
| 12 | Monday, 2 May 1644 | Spring and Labour Day |
| 13 | Wednesday, 4 May 1644 | Orthodox Easter |
| 14 | Monday, 9 May 1644 | Victory Day |
| 15 | Sunday, 12 June 1644 | Russia Day |
| 16 | Monday, 13 June 1644 | Russia Day |
| 17 | Friday, 4 November 1644 | Unity Day |